Method for producing marsh gas through two-stage united anaerobic fermentation of anaerobic digestion fiber and waste oil

Abstract

The invention belongs to the field of biomass energy and particularly relates to a method for producing marsh gas through two-stage united anaerobic fermentation of anaerobic digestion fiber and wasteoil. The method comprises the following steps that 1, anaerobic digestion fiber is pretreated by adopting acetic acid and ammonia water; 2, anaerobic digestion sludge and fat degrading bacteria are added to a basic culture medium to serve as anaerobic fermentation strains; 3, the pretreated anaerobic digestion fiber and the anaerobic fermentation strains are mixed, and then an inorganic medium isadded to obtain a mixture; 4, activated carbon is added into the mixture, and full mixing is performed to obtain a final mixture; 5, a biogas digester is cleaned, and liquid in the biogas digester issucked out; 6, the final mixture, waste oil and an additive are put into the biogas digester; 7, flammable fuel is taken and is put in a container, and the container is thrown into the biogas digester after ignition; 8, when the fuel is combusted, a biogas digester cover is put on for sealing treatment. The method fully utilizes the anaerobic digestion fiber and waste oil, the gas yield is high,and the gas producing rate is high.

Description

technical field [0001] The invention belongs to the field of biomass energy application, and in particular relates to a two-stage combined anaerobic fermentation method for producing biogas by anaerobic digestion of fiber and waste oil. Background technique [0002] Biogas is mainly produced by using animal manure, straw, industrial organic waste, municipal solid waste and other organic matter through microbial anaerobic digestion technology, and the main component methane contained in the generated biogas accounts for 40-80% of the total. The complete combustion of each cubic meter of biogas is equivalent to the heat generated by the combustion of 0.7kg of standard coal, so biogas is an important renewable biomass energy. Among them, crop stalks, fruits and vegetables and other wastes are good raw materials for anaerobic fermentation to produce biogas. The carbohydrate content is high and the raw materials are easy to obtain, but the nitrogen content is low. Therefore, the ...

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Problems solved by technology

[0004] The waste water produced by the catering industry, slaughterhouses and meat processing plants is rich in easily biodegradable organic matter and non-biodegradable oils. Among them, restaurant kitchen waste is rich in various animal and vegetable oils. There are two main methods of oil resource utilization: one is to separate it from kitchen waste and refine it into biodiesel. The process is simple and has attracted more and more attention. However, due to the poor water solubility of oil, direct anaerobic fermentation is easy to cause a long fermentation cycle; the intermediate product of oil metabolism, long-chain fatty acids, often accumulates in the system, which has an inhibitory effect on anaerobic microorganisms. , especially in the UASB anaerobic digestion reactor, it is easy to cause the anaerobic digestion system to collapse

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